diff --git a/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp b/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp
index 4902719784..07baf275d7 100644
--- a/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp
+++ b/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp
@@ -568,7 +568,7 @@ void JUCE_CALLTYPE FloatVectorOperations::add (double* dest, double amount, int
                               const Mode::ParallelType amountToAdd = Mode::load1 (amount);)
 }
 
-void JUCE_CALLTYPE FloatVectorOperations::add (float* dest, float* src, float amount, int num) noexcept
+void JUCE_CALLTYPE FloatVectorOperations::add (float* dest, const float* src, float amount, int num) noexcept
 {
    #if JUCE_USE_VDSP_FRAMEWORK
     vDSP_vsadd (src, 1, &amount, dest, 1, (vDSP_Length) num);
@@ -579,7 +579,7 @@ void JUCE_CALLTYPE FloatVectorOperations::add (float* dest, float* src, float am
    #endif
 }
 
-void JUCE_CALLTYPE FloatVectorOperations::add (double* dest, double* src, double amount, int num) noexcept
+void JUCE_CALLTYPE FloatVectorOperations::add (double* dest, const double* src, double amount, int num) noexcept
 {
    #if JUCE_USE_VDSP_FRAMEWORK
     vDSP_vsaddD (src, 1, &amount, dest, 1, (vDSP_Length) num);
diff --git a/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.h b/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.h
index f1a8d13b47..b22e3a1877 100644
--- a/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.h
+++ b/modules/juce_audio_basics/buffers/juce_FloatVectorOperations.h
@@ -66,10 +66,10 @@ public:
     static void JUCE_CALLTYPE add (double* dest, double amountToAdd, int numValues) noexcept;
 
     /** Adds a fixed value to each source value and stores it in the destination array. */
-    static void JUCE_CALLTYPE add (float* dest, float* src, float amount, int numValues) noexcept;
+    static void JUCE_CALLTYPE add (float* dest, const float* src, float amount, int numValues) noexcept;
 
     /** Adds a fixed value to each source value and stores it in the destination array. */
-    static void JUCE_CALLTYPE add (double* dest, double* src, double amount, int numValues) noexcept;
+    static void JUCE_CALLTYPE add (double* dest, const double* src, double amount, int numValues) noexcept;
 
     /** Adds the source values to the destination values. */
     static void JUCE_CALLTYPE add (float* dest, const float* src, int numValues) noexcept;